gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   4    2009, 2010  Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef RS6000_BI_ARCH
  28
  29 #undef  DEFAULT_ABI
  30 #define DEFAULT_ABI ABI_AIX
  31
  32 #undef  TARGET_64BIT
  33 #define TARGET_64BIT 1
  34
  35 #define DEFAULT_ARCH64_P 1
  36 #define RS6000_BI_ARCH_P 0
  37
  38 #else
  39
  40 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  41 #define RS6000_BI_ARCH_P 1
  42
  43 #endif
  44
  45 #ifdef IN_LIBGCC2
  46 #undef TARGET_64BIT
  47 #ifdef __powerpc64__
  48 #define TARGET_64BIT 1
  49 #else
  50 #define TARGET_64BIT 0
  51 #endif
  52 #endif
  53
  54 #undef  TARGET_AIX
  55 #define TARGET_AIX TARGET_64BIT
  56
  57 #ifdef HAVE_LD_NO_DOT_SYMS
  58 /* New ABI uses a local sym for the function entry point.  */
  59 extern int dot_symbols;
  60 #undef DOT_SYMBOLS
  61 #define DOT_SYMBOLS dot_symbols
  62 #endif
  63
  64 #define TARGET_PROFILE_KERNEL profile_kernel
  65
  66 #define TARGET_USES_LINUX64_OPT 1
  67 #ifdef HAVE_LD_LARGE_TOC
  68 extern enum rs6000_cmodel cmodel;
  69 #undef TARGET_CMODEL
  70 #define TARGET_CMODEL cmodel
  71 #define SET_CMODEL(opt) cmodel = opt
  72 #else
  73 #define SET_CMODEL(opt) do {} while (0)
  74 #endif
  75
  76 #undef  PROCESSOR_DEFAULT
  77 #define PROCESSOR_DEFAULT PROCESSOR_POWER6
  78 #undef  PROCESSOR_DEFAULT64
  79 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER6
  80
  81 /* We don't need to generate entries in .fixup, except when
  82    -mrelocatable or -mrelocatable-lib is given.  */
  83 #undef RELOCATABLE_NEEDS_FIXUP
  84 #define RELOCATABLE_NEEDS_FIXUP \
  85   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  86
  87 #undef  RS6000_ABI_NAME
  88 #define RS6000_ABI_NAME "linux"
  89
  90 #define INVALID_64BIT "-m%s not supported in this configuration"
  91 #define INVALID_32BIT INVALID_64BIT
  92
  93 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  94 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  95   do                                                            \
  96     {                                                           \
  97       if (!rs6000_explicit_options.alignment)                   \
  98         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  99       if (TARGET_64BIT)                                         \
 100         {                                                       \
 101           if (DEFAULT_ABI != ABI_AIX)                           \
 102             {                                                   \
 103               rs6000_current_abi = ABI_AIX;                     \
 104               error (INVALID_64BIT, "call");                    \
 105             }                                                   \
 106           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 107           if (target_flags & MASK_RELOCATABLE)                  \
 108             {                                                   \
 109               target_flags &= ~MASK_RELOCATABLE;                \
 110               error (INVALID_64BIT, "relocatable");             \
 111             }                                                   \
 112           if (target_flags & MASK_EABI)                         \
 113             {                                                   \
 114               target_flags &= ~MASK_EABI;                       \
 115               error (INVALID_64BIT, "eabi");                    \
 116             }                                                   \
 117           if (TARGET_PROTOTYPE)                                 \
 118             {                                                   \
 119               target_prototype = 0;                             \
 120               error (INVALID_64BIT, "prototype");               \
 121             }                                                   \
 122           if ((target_flags & MASK_POWERPC64) == 0)             \
 123             {                                                   \
 124               target_flags |= MASK_POWERPC64;                   \
 125               error ("-m64 requires a PowerPC64 cpu");          \
 126             }                                                   \
 127           if ((target_flags_explicit & MASK_MINIMAL_TOC) != 0)  \
 128             {                                                   \
 129               if (rs6000_explicit_options.cmodel                \
 130                   && cmodel != CMODEL_SMALL)                    \
 131                 error ("-mcmodel incompatible with other toc options"); \
 132               SET_CMODEL (CMODEL_SMALL);                        \
 133             }                                                   \
 134           else                                                  \
 135             {                                                   \
 136               if (!rs6000_explicit_options.cmodel)              \
 137                 SET_CMODEL (CMODEL_LARGE);                      \
 138               if (cmodel != CMODEL_SMALL)                       \
 139                 {                                               \
 140                   TARGET_NO_FP_IN_TOC = 0;                      \
 141                   TARGET_NO_SUM_IN_TOC = 0;                     \
 142                 }                                               \
 143             }                                                   \
 144         }                                                       \
 145       else                                                      \
 146         {                                                       \
 147           if (!RS6000_BI_ARCH_P)                                \
 148             error (INVALID_32BIT, "32");                        \
 149           if (TARGET_PROFILE_KERNEL)                            \
 150             {                                                   \
 151               TARGET_PROFILE_KERNEL = 0;                        \
 152               error (INVALID_32BIT, "profile-kernel");          \
 153             }                                                   \
 154           if (rs6000_explicit_options.cmodel)                   \
 155             {                                                   \
 156               SET_CMODEL (CMODEL_SMALL);                        \
 157               error (INVALID_32BIT, "cmodel");                  \
 158             }                                                   \
 159         }                                                       \
 160     }                                                           \
 161   while (0)
 162
 163 #ifdef  RS6000_BI_ARCH
 164
 165 #undef  OVERRIDE_OPTIONS
 166 #define OVERRIDE_OPTIONS \
 167   rs6000_override_options (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 168                            ? (char *) 0 : TARGET_CPU_DEFAULT)
 169
 170 #endif
 171
 172 #undef  ASM_DEFAULT_SPEC
 173 #undef  ASM_SPEC
 174 #undef  LINK_OS_LINUX_SPEC
 175
 176 /* FIXME: This will quite possibly choose the wrong dynamic linker.  */
 177 #undef  LINK_OS_GNU_SPEC
 178 #define LINK_OS_GNU_SPEC LINK_OS_LINUX_SPEC
 179
 180 #ifndef RS6000_BI_ARCH
 181 #define ASM_DEFAULT_SPEC "-mppc64"
 182 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 183 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 184 #else
 185 #if DEFAULT_ARCH64_P
 186 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 187 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 188 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 189 #else
 190 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 191 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 192 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 193 #endif
 194 #endif
 195
 196 #define ASM_SPEC32 "-a32 %{n} %{T} %{Ym,*} %{Yd,*} \
 197 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 198 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 199 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 200     %{mcall-freebsd: -mbig} \
 201     %{mcall-i960-old: -mlittle} \
 202     %{mcall-linux: -mbig} \
 203     %{mcall-gnu: -mbig} \
 204     %{mcall-netbsd: -mbig} \
 205 }}}}"
 206
 207 #define ASM_SPEC64 "-a64"
 208
 209 #define ASM_SPEC_COMMON "%(asm_cpu) \
 210 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 211 %{v:-V} %{Qy:} %{!Qn:-Qy} %{Wa,*:%*} \
 212 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 213
 214 #undef  SUBSUBTARGET_EXTRA_SPECS
 215 #define SUBSUBTARGET_EXTRA_SPECS \
 216   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 217   { "asm_spec32",               ASM_SPEC32 },                           \
 218   { "asm_spec64",               ASM_SPEC64 },                           \
 219   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 220   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 221
 222 #undef  MULTILIB_DEFAULTS
 223 #if DEFAULT_ARCH64_P
 224 #define MULTILIB_DEFAULTS { "m64" }
 225 #else
 226 #define MULTILIB_DEFAULTS { "m32" }
 227 #endif
 228
 229 #ifndef RS6000_BI_ARCH
 230
 231 /* 64-bit PowerPC Linux is always big-endian.  */
 232 #undef  TARGET_LITTLE_ENDIAN
 233 #define TARGET_LITTLE_ENDIAN    0
 234
 235 /* 64-bit PowerPC Linux always has a TOC.  */
 236 #undef  TARGET_TOC
 237 #define TARGET_TOC              1
 238
 239 /* Some things from sysv4.h we don't do when 64 bit.  */
 240 #undef  TARGET_RELOCATABLE
 241 #define TARGET_RELOCATABLE      0
 242 #undef  TARGET_EABI
 243 #define TARGET_EABI             0
 244 #undef  TARGET_PROTOTYPE
 245 #define TARGET_PROTOTYPE        0
 246 #undef RELOCATABLE_NEEDS_FIXUP
 247 #define RELOCATABLE_NEEDS_FIXUP 0
 248
 249 #endif
 250
 251 /* We use glibc _mcount for profiling.  */
 252 #define NO_PROFILE_COUNTERS 1
 253 #define PROFILE_HOOK(LABEL) \
 254   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 255
 256 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 257 #undef  ADJUST_FIELD_ALIGN
 258 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 259   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 260    ? 128                                                                \
 261    : (TARGET_64BIT                                                      \
 262       && TARGET_ALIGN_NATURAL == 0                                      \
 263       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 264    ? MIN ((COMPUTED), 32)                                               \
 265    : (COMPUTED))
 266
 267 /* PowerPC64 Linux increases natural record alignment to doubleword if
 268    the first field is an FP double, only if in power alignment mode.  */
 269 #undef  ROUND_TYPE_ALIGN
 270 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 271   ((TARGET_64BIT                                                        \
 272     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 273         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 274         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 275     && TARGET_ALIGN_NATURAL == 0)                                       \
 276    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 277    : MAX ((COMPUTED), (SPECIFIED)))
 278
 279 /* Use the default for compiling target libs.  */
 280 #ifdef IN_TARGET_LIBS
 281 #undef TARGET_ALIGN_NATURAL
 282 #define TARGET_ALIGN_NATURAL 1
 283 #endif
 284
 285 /* Indicate that jump tables go in the text section.  */
 286 #undef  JUMP_TABLES_IN_TEXT_SECTION
 287 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 288
 289 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 290    than a doubleword should be padded upward or downward.  You could
 291    reasonably assume that they follow the normal rules for structure
 292    layout treating the parameter area as any other block of memory,
 293    then map the reg param area to registers.  i.e. pad upward.
 294    Setting both of the following defines results in this behavior.
 295    Setting just the first one will result in aggregates that fit in a
 296    doubleword being padded downward, and others being padded upward.
 297    Not a bad idea as this results in struct { int x; } being passed
 298    the same way as an int.  */
 299 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 300 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 301
 302 /* Specify padding for the last element of a block move between
 303    registers and memory.  FIRST is nonzero if this is the only
 304    element.  */
 305 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 306   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 307
 308 /* __throw will restore its own return address to be the same as the
 309    return address of the function that the throw is being made to.
 310    This is unfortunate, because we want to check the original
 311    return address to see if we need to restore the TOC.
 312    So we have to squirrel it away with this.  */
 313 #define SETUP_FRAME_ADDRESSES() \
 314   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 315
 316 /* Override svr4.h  */
 317 #undef MD_EXEC_PREFIX
 318 #undef MD_STARTFILE_PREFIX
 319
 320 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 321    process.  */
 322 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 323
 324 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 325
 326 /* glibc has float and long double forms of math functions.  */
 327 #undef  TARGET_C99_FUNCTIONS
 328 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 329
 330 /* Whether we have sincos that follows the GNU extension.  */
 331 #undef  TARGET_HAS_SINCOS
 332 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 333
 334 #undef  TARGET_OS_CPP_BUILTINS
 335 #define TARGET_OS_CPP_BUILTINS()                        \
 336   do                                                    \
 337     {                                                   \
 338       if (TARGET_64BIT)                                 \
 339         {                                               \
 340           builtin_define ("__PPC__");                   \
 341           builtin_define ("__PPC64__");                 \
 342           builtin_define ("__powerpc__");               \
 343           builtin_define ("__powerpc64__");             \
 344           builtin_assert ("cpu=powerpc64");             \
 345           builtin_assert ("machine=powerpc64");         \
 346         }                                               \
 347       else                                              \
 348         {                                               \
 349           builtin_define_std ("PPC");                   \
 350           builtin_define_std ("powerpc");               \
 351           builtin_assert ("cpu=powerpc");               \
 352           builtin_assert ("machine=powerpc");           \
 353           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 354         }                                               \
 355     }                                                   \
 356   while (0)
 357
 358 #undef  CPP_OS_DEFAULT_SPEC
 359 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 360
 361 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 362    defined on glibc-based systems. This temporary hack accomplishes this,
 363    it should go away as soon as libstdc++-v3 has a real fix.  */
 364 #undef  CPLUSPLUS_CPP_SPEC
 365 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 366
 367 #undef  LINK_SHLIB_SPEC
 368 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 369
 370 #undef  LIB_DEFAULT_SPEC
 371 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 372
 373 #undef  STARTFILE_DEFAULT_SPEC
 374 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 375
 376 #undef  ENDFILE_DEFAULT_SPEC
 377 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 378
 379 #undef  LINK_START_DEFAULT_SPEC
 380 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 381
 382 #undef  LINK_OS_DEFAULT_SPEC
 383 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 384
 385 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 386 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 387 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 388 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 389 #if DEFAULT_LIBC == LIBC_UCLIBC
 390 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 391 #elif DEFAULT_LIBC == LIBC_GLIBC
 392 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 393 #else
 394 #error "Unsupported DEFAULT_LIBC"
 395 #endif
 396 #define LINUX_DYNAMIC_LINKER32 \
 397   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 398 #define LINUX_DYNAMIC_LINKER64 \
 399   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 400
 401
 402 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 403   %{rdynamic:-export-dynamic} \
 404   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}}"
 405
 406 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 407   %{rdynamic:-export-dynamic} \
 408   %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}}"
 409
 410 #undef  TOC_SECTION_ASM_OP
 411 #define TOC_SECTION_ASM_OP \
 412   (TARGET_64BIT                                         \
 413    ? "\t.section\t\".toc\",\"aw\""                      \
 414    : "\t.section\t\".got\",\"aw\"")
 415
 416 #undef  MINIMAL_TOC_SECTION_ASM_OP
 417 #define MINIMAL_TOC_SECTION_ASM_OP \
 418   (TARGET_64BIT                                         \
 419    ? "\t.section\t\".toc1\",\"aw\""                     \
 420    : ((TARGET_RELOCATABLE || flag_pic)                  \
 421       ? "\t.section\t\".got2\",\"aw\""                  \
 422       : "\t.section\t\".got1\",\"aw\""))
 423
 424 #undef  TARGET_VERSION
 425 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 426
 427 /* Must be at least as big as our pointer type.  */
 428 #undef  SIZE_TYPE
 429 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 430
 431 #undef  PTRDIFF_TYPE
 432 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 433
 434 #undef  WCHAR_TYPE
 435 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 436 #undef  WCHAR_TYPE_SIZE
 437 #define WCHAR_TYPE_SIZE 32
 438
 439 /* Override rs6000.h definition.  */
 440 #undef  ASM_APP_ON
 441 #define ASM_APP_ON "#APP\n"
 442
 443 /* Override rs6000.h definition.  */
 444 #undef  ASM_APP_OFF
 445 #define ASM_APP_OFF "#NO_APP\n"
 446
 447 /* PowerPC no-op instruction.  */
 448 #undef  RS6000_CALL_GLUE
 449 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 450
 451 #undef  RS6000_MCOUNT
 452 #define RS6000_MCOUNT "_mcount"
 453
 454 #ifdef __powerpc64__
 455 /* _init and _fini functions are built from bits spread across many
 456    object files, each potentially with a different TOC pointer.  For
 457    that reason, place a nop after the call so that the linker can
 458    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 459 #if DOT_SYMBOLS
 460 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 461   asm (SECTION_OP "\n"                                  \
 462 "       bl ." #FUNC "\n"                                \
 463 "       nop\n"                                          \
 464 "       .previous");
 465 #else
 466 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 467   asm (SECTION_OP "\n"                                  \
 468 "       bl " #FUNC "\n"                                 \
 469 "       nop\n"                                          \
 470 "       .previous");
 471 #endif
 472 #endif
 473
 474 /* FP save and restore routines.  */
 475 #undef  SAVE_FP_PREFIX
 476 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 477 #undef  SAVE_FP_SUFFIX
 478 #define SAVE_FP_SUFFIX ""
 479 #undef  RESTORE_FP_PREFIX
 480 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 481 #undef  RESTORE_FP_SUFFIX
 482 #define RESTORE_FP_SUFFIX ""
 483
 484 /* Dwarf2 debugging.  */
 485 #undef  PREFERRED_DEBUGGING_TYPE
 486 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 487
 488 /* This is how to declare the size of a function.  */
 489 #undef  ASM_DECLARE_FUNCTION_SIZE
 490 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 491   do                                                                    \
 492     {                                                                   \
 493       if (!flag_inhibit_size_directive)                                 \
 494         {                                                               \
 495           fputs ("\t.size\t", (FILE));                                  \
 496           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 497             putc ('.', (FILE));                                         \
 498           assemble_name ((FILE), (FNAME));                              \
 499           fputs (",.-", (FILE));                                        \
 500           rs6000_output_function_entry (FILE, FNAME);                   \
 501           putc ('\n', (FILE));                                          \
 502         }                                                               \
 503     }                                                                   \
 504   while (0)
 505
 506 /* Return nonzero if this entry is to be written into the constant
 507    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 508    or a CONST containing one of them.  If -mfp-in-toc (the default),
 509    we also do this for floating-point constants.  We actually can only
 510    do this if the FP formats of the target and host machines are the
 511    same, but we can't check that since not every file that uses
 512    the macros includes real.h.  We also do this when we can write the
 513    entry into the TOC and the entry is not larger than a TOC entry.  */
 514
 515 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 516 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 517   (TARGET_TOC                                                           \
 518    && (GET_CODE (X) == SYMBOL_REF                                       \
 519        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 520            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 521        || GET_CODE (X) == LABEL_REF                                     \
 522        || (GET_CODE (X) == CONST_INT                                    \
 523            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 524        || (GET_CODE (X) == CONST_DOUBLE                                 \
 525            && ((TARGET_64BIT                                            \
 526                 && (TARGET_MINIMAL_TOC                                  \
 527                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 528                         && ! TARGET_NO_FP_IN_TOC)))                     \
 529                || (!TARGET_64BIT                                        \
 530                    && !TARGET_NO_FP_IN_TOC                              \
 531                    && !TARGET_RELOCATABLE                               \
 532                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 533                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 534
 535 /* Select a format to encode pointers in exception handling data.  CODE
 536    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 537    true if the symbol may be affected by dynamic relocations.  */
 538 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 539 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 540   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 541    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 542       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 543    : DW_EH_PE_absptr)
 544
 545 /* For backward compatibility, we must continue to use the AIX
 546    structure return convention.  */
 547 #undef DRAFT_V4_STRUCT_RET
 548 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 549
 550 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
 551
 552 #define TARGET_POSIX_IO
 553
 554 #define LINK_GCC_C_SEQUENCE_SPEC \
 555   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 556
 557 /* Use --as-needed -lgcc_s for eh support.  */
 558 #ifdef HAVE_LD_AS_NEEDED
 559 #define USE_LD_AS_NEEDED 1
 560 #endif
 561
 562 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
 563
 564 #ifdef TARGET_LIBC_PROVIDES_SSP
 565 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 566    ppc64 glibc provides it at -0x7010(13).  */
 567 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 568 #endif
 569
 570 #define POWERPC_LINUX
 571
 572 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 573 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 574 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 575 #endif